Manufacturing tolerances

PCB tolerances

Thanks to a high degree of automation, the latest machinery, highly qualified staff and seamless control / analysis, we keep our processes stable. Our decades of experience help us to make the right decisions.

Our circuit boards are manufactured in accordance with the valid IPC guidelines and standards (et al. IPC-A-600 class 2) and on the basis of the following technical specifications (tolerances). HDI or MFT boards can be produced with smaller tolerances.

Deviating specifications must be explicitly agreed!

Pattern tolerances

The hole pattern for vias (DK) goes through all the layers of the circuit and therefore serves as a location reference for the other patterns.

TypeTolerance
TypeDrilling pattern (PTH) to conductive pattern outer layersTolerance±0,10mm
TypeDrilling pattern (PTH) to conductive pattern inner layers Tolerance±0,15mm
TypeDrilling pattern (PTH) to milling pattern / contourTolerance±0,10mm
TypeDrilling pattern (NPTH) to milling pattern / contourTolerance±0,10mm
TypeDrilling pattern (PTH) to legend printTolerance±0,15mm
Type Tolerance 
TypeConductive pattern to solder resistTolerance±0,10mm
TypeConductive pattern to legend printTolerance±0,20mm
Type Tolerance 
TypeHole to hole, one pass* (PTH-PTH or NPTH-NPTH)Tolerance±0,05mm
TypeHole to hole, two passes (PTH-NPTH)Tolerance±0,10mm

* Also applies for PTH-NPTH if they are drilled in one run (e.g. location holes for SMD stencils).

Vias & Drills, Press-fit

TypeFinal-Ø
TypePlated-through-holes (PTH) and component holesFinal-ر0,10mm
TypeNon-plated-through-holes (NPTH)Final-ر0,08mm
TypePress-fit (drilled)Final-ر0,05mm
Type> on requestFinal-Ø+0,10mm/-0mm
TypePress-fit (milled*)Final-ر0,075mm

*From a final diameter of approx. 6.0mm (depending on the surface) the holes are milled, not drilled.

Cu thickness in vias

Via typeClass 2 (standard)class 3
Via typeVia (> 150µm)Class 2 (standard)min. 20µm - 25µmclass 3min. 20µm - 25µm
Via typeMicrovia (≤ 150µm)Class 2 (standard)min. 18µm - 20µmclass 3min. 20µm - 25µm
Via typeBlind ViaClass 2 (standard)min. 10µm - 12µmclass 3min. 10µm - 12µm
Via typeBuried ViaClass 2 (standard)min. 10µm - 12µmclass 3min. 10µm - 12µm

Conductor

TypeToleranceReference
TypeConductor width*Tolerancemin. 80%Referencein comparsion to the data
TypeConductor space*Tolerancemax. 30% reduction (standard)Referencein comparsion to the data

*acc. to IPC-6012C

Impedance control

TypeTolerance Mode
TypeImpedance controlTolerance 10%Modenormal
TypeImpedance controlTolerance 5%Modeextended

Milling

TypeTolerance
TypeMilling offsetTolerance±0,10mm
TypeZ-Axis milling depthTolerance±0,20mm

Scoring

TypeTolerance
TypeOffset (to PCB center)Tolerance±0,10mm
TypeDrilling pattern (PTH) to scoring patternTolerance±0,15mm
TypeDrilling pattern (NPTH) to scoring patternTolerance±0,20mm
TypePCB dimension x/yTolerance±0,15mm
TypeScoring depthTolerance±0,20mm

Base material - rigid PCBs

TypeTolerance
TypeBase material thicknessTolerance±10%

The information about the base material thickness exclusively defines the thickness of the dielectric including base copper. The other layer structures such as electroplated Cu layers or solder resist layers result in increased final thickness.

Base material - flexible PCBs

TypeTolerance
TypeDielectric thickness ≥ 0,075mmTolerance±10%
Type0,025mm ≤ Dielectric thickness ≥ 0,075mmTolerance±10%
Type0,020mm ≤ Dielectric thickness ≥ 0,025mmTolerance±12,5%
TypeDielectric thickness < 0,020mmTolerance±15%
Type Tolerance 
TypeAdhesive thickness ≥ 0,075mmTolerance±10%
Type0,025mm ≤ Adhesive thickness ≥ 0,075mmTolerance±15%
Type0,020mm ≤ Adhesive thickness ≥ 0,025mmTolerance±20%
TypeAdhesive thickness < 0,020mmTolerance±30%
TypeFor woven or combinations with woven stiffener:
Adhesive thickness ≥ 0,025mm
Tolerance±20%

Specifications according to IPC-4204A. The information on the thickness of the base material defines solely the dielectric thickness or adhesive thickness incl. base copper. The other layer structures such as e.g. galvanic Cu or solder-stop lead to an increased circuit final thickness.

Rigid PCB thickness

TypeTolerance
TypeProducibility level B (standard)ToleranceThe higher value of ±10% or ±178µm

Thickness tolerances for pressed multilayers according to IPC-2222A. When measured over metallizations or coatings, those thicknesses and tolerances must be considered.

Flexible PCB thickness

TypeTolerance
TypeFlexible part thickness Tolerance±50µm
TypeFlexible part + stiffener thickness Tolerance±100µm

Bow & Twist

For PCBs ≥ 0,8mm thicknessTolerance
For PCBs ≥ 0,8mm thicknesswith SMDTolerance0,75%
For PCBs ≥ 0,8mm thicknesswithout SMDTolerance1,50%

Please note that the twist & bow value is increased above average, if the copper balance of the PCB is locally very unequal or if the circuit board is very thin.

Surfaces

SurfacePCB RoHS-compliantRoHS-compliantPCB solderingSolderingPCB Bonding aluminium wireBonding aluminium wirePCB Bonding gold wireBonding gold wirePCB BGABGAPCB Flex-/Rigid-FlexFlex-/Rigid-FlexPCB PressfitPressfitPCB PCI contactsPCI contactsPCB sliding contactSliding contactPCB surface thicknessThicknessPCB shelf lifeShelf lifePCB Reflow CyclesReflow Cycles
SurfaceHal SnPbPCB RoHS-compliantRoHS-compliant PCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness>5µmPCB shelf lifeShelf lifeca.12 monthsPCB Reflow CyclesReflow Cycles5**
SurfaceHAL lead-freePCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThicknessacc. to IPC-6012*PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles5**
SurfaceChemical tinPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness>1µmPCB shelf lifeShelf lifeca. 6 monthsPCB Reflow CyclesReflow Cycles5**
SurfaceChemical silverPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wire PCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness0.12 - 0.3µmPCB shelf lifeShelf lifeca. 6 monthsPCB Reflow CyclesReflow Cycles5**
SurfaceChemical gold
ENIG
PCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wire PCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-FlexcheckPCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness3-6µm Ni
0.05-0.1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles5**
SurfaceENEPIGPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wirecheckPCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness3-8µm Ni
0.05-0.15µm Pd
0.05-0.1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles-
SurfaceGalvanic softgoldPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wirecheckPCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfit PCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness4 - 6µm Ni
>1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles-
SurfaceGalvanic hardgoldPCB RoHS-compliantRoHS-compliantcheckPCB solderingSoldering PCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfit PCB PCI contactsPCI contactscheckPCB sliding contactSliding contactcheckPCB surface thicknessThickness4 - 6µm Ni
0.8 - 2µm Au
PCB shelf lifeShelf lifeca. 12 months
on request
PCB Reflow CyclesReflow Cycles-

* IPC-6012: Fully covered and solderable | ** not reliable empirical values

Solder-stop

TypeCoating thickness
TypeOn the PCB Coating thickness > 10µm
TypeOn the conductor edgeCoating thickness> 5µm

Dielectric strength min. 500V DC.

Delivery quantity

PiecesTolerance
Pieces1 - 20 pcs.ToleranceExcess or short delivery 0%
Piecesfrom 21 pcs.ToleranceExcess or short delivery of up to10%

On request, we also deliver quantities of more than 20 pieces in exact quantities, without under- or over-delivery.
The (single) piece rule also applies when ordering as panel.